Brother International HL 1240 Service Manual - Page 147

I-18 Gray background CHAPTER 6 TROUBLESHOOTING Possible cause Step Check Result Remedy Print paper 1 Does the paper being used meet the paper specification (weight, etc.). No Recommend to use the specified types of paper. Yes Recommend to change to freshly unpacked paper. Toner sensing failure (printer side) 2 Is Ready LED on even after removing the drum unit and toner cartridge? Yes Toner sensor failure. Clean the toner sensor and check the toner sensor connection. Toner cartridge failure 3 Is the problem solved after replacing the toner cartridge? Yes Replace the toner cartridge. Drum unit failure 4 Is the problem solved after replacing the drum unit? Yes Replace the drum unit. No Replace the high-voltage power supply PCB. NOTE: The following cases increase the possibility of this problem. Acid paper is being used. The drum unit is at the end of its life. There is dust or paper powder. I-19 Hollow print User Check (1) Check the paper used meets the recommended paper specifications. (2) Select the 'Thick paper mode' in the printer driver, or use thinner paper than you are currently using. (3) Check the printer's environment, conditions such as high humidity may cause this situation to occur. Possible cause Print paper Step Check 1 Is thick paper of more than 43lb being used or extremely rough surface paper? Result Remedy Yes Recommend to use the specified types of paper. No Refer and compare with I-15. 6-37